On X, I could change gamma by tuning the xorg.conf file and add a "Gamma" line with the right value to the "Monitor Section". How do I do this on wayland? [edit]Or: What's the name of the tool for doing this in wayland and how can I make that config persistent?·[/edit]
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Did you ever find a way to do it? – Matthieu Apr 02 '19 at 08:21
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No. Still, no clue for this. – Mitsch Jan 19 '20 at 15:42
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Guess it's only doable with icc-profiles in f.e. the GNOME-preferences (Devices-Colors). – Mitsch Jan 19 '20 at 16:55
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Still no means in Wayland to adjust gamma? – rob grune Apr 22 '22 at 02:08
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The Python script in this repo seems to do the trick. [https://github.com/zb3/gnome-gamma-tool] It had some dependencies I needed to install with apt and pip, but it's working for me. Just installed Ubuntu 22.04 and still fighting to get apps to go fullscreen... – Sep 13 '22 at 21:51
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Try ddcutil to set it.
$ sudo su
# apt install ddcutil
# ddcutil getvcp color
When I run this, I get this control for Gamma:
VCP code 0x72 (Gamma ): 0x0000 - Mode: White absolute adjustment (sl=0x00), gamma=1.00 (sh=0x00)
But I think every monitor is different. My Dell 24" doesn't seem to allow changing that entry, but it does allow me to set brightness, e.g, with ddcutil setvcp ...
So your mileage may vary, but it is worth it to try.
Also, I haven't figured out yet if gamma is something your set for monitor, or for graphics card? If you are on nvidia, you could also try the nvidia-settting tool.
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